#include <stdio.h>

int main ()
{

    int a = 10 ;

    int b = -a ;

    int c = -10 ;

    printf ("a = %d , b = %d , c = %d " , a , b , c) ;

    int d = -10 ;

    int e = -d ;

    printf ("d = %d , e = %d" , d , e) ;

    return 0 ;

}